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    Subject[RFC patch 11/20] LTTng Kernel Trace Thread Flag MIPS
    Add a thread flag to activate system-wide syscall tracing.

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    ---
    arch/mips/include/asm/thread_info.h | 4 +++-
    arch/mips/kernel/entry.S | 2 +-
    2 files changed, 4 insertions(+), 2 deletions(-)

    Index: linux-2.6-lttng/arch/mips/include/asm/thread_info.h
    ===================================================================
    --- linux-2.6-lttng.orig/arch/mips/include/asm/thread_info.h 2009-03-23 22:40:31.000000000 -0400
    +++ linux-2.6-lttng/arch/mips/include/asm/thread_info.h 2009-03-23 22:41:55.000000000 -0400
    @@ -125,6 +125,7 @@ register struct thread_info *__current_t
    #define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
    #define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
    #define TIF_LOAD_WATCH 25 /* If set, load watch registers */
    +#define TIF_KERNEL_TRACE 30 /* kernel trace active */
    #define TIF_SYSCALL_TRACE 31 /* syscall trace active */

    #ifdef CONFIG_MIPS32_O32
    @@ -134,6 +135,7 @@ register struct thread_info *__current_t
    #endif /* CONFIG_MIPS32_O32 */

    #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
    +#define _TIF_KERNEL_TRACE (1<<TIF_KERNEL_TRACE)
    #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
    #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
    #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
    @@ -152,7 +154,7 @@ register struct thread_info *__current_t
    /* work to do on interrupt/exception return */
    #define _TIF_WORK_MASK (0x0000ffef & ~_TIF_SECCOMP)
    /* work to do on any return to u-space */
    -#define _TIF_ALLWORK_MASK (0x8000ffff & ~_TIF_SECCOMP)
    +#define _TIF_ALLWORK_MASK (0xc000ffff & ~_TIF_SECCOMP)

    #endif /* __KERNEL__ */

    Index: linux-2.6-lttng/arch/mips/kernel/entry.S
    ===================================================================
    --- linux-2.6-lttng.orig/arch/mips/kernel/entry.S 2009-03-23 22:38:01.000000000 -0400
    +++ linux-2.6-lttng/arch/mips/kernel/entry.S 2009-03-23 22:40:40.000000000 -0400
    @@ -167,7 +167,7 @@ work_notifysig: # deal with pending s
    FEXPORT(syscall_exit_work_partial)
    SAVE_STATIC
    syscall_exit_work:
    - li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
    + li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_KERNEL_TRACE
    and t0, a2 # a2 is preloaded with TI_FLAGS
    beqz t0, work_pending # trace bit set?
    local_irq_enable # could let do_syscall_trace()
    --
    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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